US7740364B2 - Backlight unit and liquid crystal display device employing the same - Google Patents

Backlight unit and liquid crystal display device employing the same Download PDF

Info

Publication number
US7740364B2
US7740364B2 US11/293,227 US29322705A US7740364B2 US 7740364 B2 US7740364 B2 US 7740364B2 US 29322705 A US29322705 A US 29322705A US 7740364 B2 US7740364 B2 US 7740364B2
Authority
US
United States
Prior art keywords
light sources
point light
liquid crystal
backlight unit
crystal display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US11/293,227
Other languages
English (en)
Other versions
US20060221629A1 (en
Inventor
Ki-bum Seong
Il-yong Jung
Tae-hee Cho
Jong-min Wang
Jin-kyoung Oh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Assigned to SAMSUNG ELECTRONICS CO., LTD. reassignment SAMSUNG ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHO, TAE-HEE, JUNG, IL-YONG, OH, JIN-KYOUNG, SEONG, KI-BUM, WANG, JONG-MIN
Publication of US20060221629A1 publication Critical patent/US20060221629A1/en
Application granted granted Critical
Publication of US7740364B2 publication Critical patent/US7740364B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
    • B60G17/052—Pneumatic spring characteristics
    • B60G17/0523—Regulating distributors or valves for pneumatic springs
    • B60G17/0525—Height adjusting or levelling valves
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/32—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds
    • B60G11/34—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds including leaf springs
    • B60G11/46—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds including leaf springs and also fluid springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B60G17/018—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the use of a specific signal treatment or control method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2300/00—Indexing codes relating to the type of vehicle
    • B60G2300/34—Ambulances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/01—Attitude or posture control
    • B60G2800/012—Rolling condition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/10—Road Vehicles
    • B60Y2200/11—Passenger cars; Automobiles
    • B60Y2200/116—Ambulances
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133621—Illuminating devices providing coloured light
    • G02F1/133622—Colour sequential illumination
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • H01L33/60—Reflective elements

Definitions

  • the present invention relates to a backlight unit and a liquid crystal display device employing the same and, more particularly, to a direct light type backlight unit having a structure in which divided luminance areas are sequentially turned on and off and a liquid crystal display device employing the backlight unit.
  • a liquid crystal display which is one type of flat panel display, is a passive display that forms an image without using self-luminescence but instead using incident light from the outside.
  • a backlight unit is disposed at a rear of the LCD to irradiate light toward the liquid crystal panel.
  • a cold cathode fluorescence lamp is generally used as a light source for backlight units.
  • the CCFL has a comparatively short lifespan and inferior color reproducibility. It is also impossible instantly to turn on the CCFL. Therefore, when a backlight unit using the CCFL is divided into a plurality of luminance areas, the luminance areas cannot be sequentially turned on in synchronization with a screen scanning of a liquid crystal device. Hence, it is difficult effectively to prevent a motion blur in which after-images remain when an image frame is transferred to another image frame in a liquid crystal display device.
  • a backlight unit using a point light source such as a light emitting diode (LED)
  • a point light source such as a light emitting diode (LED)
  • Examples of such a backlight unit are disclosed in Korea Patent Application No. 10-2003-0019834, entitled “STRUCTURE OF BACKLIGHT UNIT FOR LIQUID CRYSTAL DISPLAY”, and Korea Patent Application No. 10-2003-0023052, entitled “STRUCTURE OF BACKLIGHT UNIT FOR LIQUID CRYSTAL DISPLAY”.
  • a light guide panel is divided into a plurality of divided blocks, and a light emitting diode is mounted on each side of the divided blocks. Groove-shaped boundary regions corresponding to the boundaries between divided blocks are formed on a rear side of the light guide plate, and thus leaking of light emitted from the LED into adjacent blocks is prevented.
  • a light guide plate is also divided into a plurality of blocks, and an LED is mounted at a side surface of each of the divided blocks.
  • each of the divided blocks is formed to have a refractive index decreasing from a central part to a boundary part for preventing the light emitted from the LED from leaking into adjacent blocks.
  • the above mentioned conventional backlight units are edge light type backlight units in which a light source is mounted at an edge of a light guide panel (LGP) and light emitted from the light source is transferred to a liquid crystal panel.
  • the edge light type backlight unit has a difficulty to transfer uniformly the light to the liquid crystal panel and has a degraded light efficiency.
  • the LGP is divided into a plurality of blocks and the blocks sequentially emit light, it is important to prevent light emitted from a block from leaking into adjacent blocks.
  • the conventional backlight units are not able perfectly to prevent light leakage. Particularly, when the refractive index of each block of the light guide panel gradually changes over the block, there must be large light loss in the block and a manufacturing cost of the light guide panel increases. Also, a comparatively large amount of light leaks into the adjacent areas.
  • the present invention provides a direct light type backlight unit having an improved structure in which divided luminance areas are sequentially turned on and off, and a liquid crystal display employing the backlight unit.
  • the present invention also provides a direct light type backlight unit which has superior color reproducibility and a comparatively longer lifespan and in which a plurality of divided luminance areas can be sequentially and instantly turned on and off in synchronization with a screen scanning of a liquid crystal display panel, and light diffusion into adjacent luminance areas is perfectly prevented, and a liquid crystal display device employing the same.
  • a backlight unit including: a base substrate; a plurality of point light sources arranged in a plurality of lines and mounted on the base substrate; and a reflector sheet, vertically disposed over the base substrate between lines of the point light sources, which reflects light emitted from the point light sources.
  • the plurality of point light source lines may be sequentially turned on at predetermined time intervals.
  • the point light source lines may be repeatedly turned on and off in a regular cycle, and one line of point light sources may be turned on after a previous line of the point light sources is turned on and a predetermined time period has elapsed.
  • the point light sources may emit light vertically with respect to the base substrate.
  • the point light sources may include red light sources, green light sources and blue light sources and emit a white light and may be one of laser diodes and light emitting diodes.
  • the backlight unit may further include a diffusion panel which diffuses light emitted from the point light sources to generate a uniform transmitted light.
  • a liquid crystal display device having a liquid crystal display panel and a backlight unit arranged at a rear of the liquid crystal display panel for radiating light to the liquid crystal display panel
  • the backlight unit includes: a base substrate; a plurality of point light sources arranged in a plurality of lines and mounted on the base substrate; and a reflector sheet vertically disposed over the base substrate between lines of the point light sources, which reflects light emitted from the point light sources.
  • Each of the point light source lines may be turned on in synchronization with a screen scanning of the liquid crystal display panel.
  • FIG. 1A illustrates an arrangement of light emitting diodes (LED) in a direct light type backlight unit according to an embodiment of the present invention
  • FIG. 1B illustrates a diffusion plate having barrier walls in a backlight unit according to an embodiment of the present invention
  • FIG. 2 is a cross-sectional view of a liquid crystal display device having the backlight unit according to the embodiment illustrated in FIGS. 1A and 1B ;
  • FIG. 3A illustrates a method of individually turning on point light source lines in the backlight unit according to the embodiment illustrated in FIGS. 1A and 1B ;
  • FIG. 3B illustrates the point light source lines which are individually turned-on in the backlight unit according to the embodiment illustrated in FIGS. 1A to 2 ;
  • FIG. 4A is a cross-sectional view illustrating a light-diffusion state in a conventional backlight unit having no reflector sheets;
  • FIG. 4B illustrates the result of simulation for light uniformity of the conventional backlight unit of FIG. 4A ;
  • FIG. 5A is a cross-sectional view illustrating a light-diffusion state in a backlight unit having reflector sheets.
  • FIG. 5B illustrates the result of simulation for light uniformity of the backlight unit illustrated in FIG. 5A .
  • FIG. 1A is a perspective view of a base substrate 10 in a direct light type backlight unit according to an embodiment of the present invention.
  • FIG. 1B is a perspective view of a diffusion plate 12 in the backlight unit according to an exemplary embodiment of the present invention.
  • the direct light type backlight unit includes the base substrate 10 , a plurality of point light sources 11 arranged in a plurality of lines, the diffusion plate 12 for generating a uniform transmitted light by diffusing light emitted from the point light sources 11 , and a plurality of reflector sheets 13 vertically formed on the diffusion plate 12 .
  • a laser diode (LD) or a light emitting diode (LED) may be used as the point light source 11 .
  • the point light sources 11 such as LDs or LEDs, provide better color reproducibility and a longer lifespan as compared to a rod light source using a cold cathode fluorescent lamp (CCFL).
  • CCFL cold cathode fluorescent lamp
  • the point light sources 11 such as the LDs or the LEDs can be instantly turned on and off
  • the backlight unit using the point light sources 11 made of the LDs or the LEDs can be turned on or off by synchronizing with a screen scanning time of the liquid crystal display device. Accordingly, the point light sources 11 are arranged on the base substrate 10 in a plurality of lines as shown in FIG. 1A .
  • the point light sources 11 are arranged in lines from a first point light source line 11 a to an n-th point light source line 11 n .
  • the number of lines may be properly determined according to a size of a liquid crystal display panel on which the backlight unit is mounted. For example, a 26-inch LCD TV includes 768 lines of pixels in a longitudinal direction. If one line of point light sources is designed to illuminate 7 lines of pixels, 110 lines of point light sources are required.
  • the point light sources 11 include three types of light sources emitting red (R), greed (G), and blue (B) light, so that a white light is vertically emitted.
  • a plurality of reflector sheets 13 are vertically mounted on the diffusion plate 12 .
  • the plurality of reflector sheets 13 are arranged parallel to the lines of point light sources and between the lines of point light sources, and reflect light emitted from the point light sources 11 . Accordingly, the reflector sheets 13 divide the backlight unit into a plurality of luminance areas and prevents light emitted from one luminance area from being diffused to adjacent luminance areas.
  • the reflector sheets 13 may be mounted on the base substrate 10 .
  • FIG. 2 is a cross sectional view of a liquid crystal display device having the backlight unit illustrated in FIGS. 1A and 1B .
  • the liquid crystal display device includes a liquid crystal panel and the backlight unit illustrated in FIGS. 1A and 1B arranged at a rear of the liquid crystal panel to radiate light onto the liquid crystal panel.
  • the backlight unit includes the base substrate 10 ; the plurality of point light sources arranged in a plurality of lines on the base substrate 10 , the diffusion panel 12 arranged in parallel to the base substrate 10 , the reflector sheets 13 vertically mounted on areas of the diffusion panel 12 between lines of the point light sources 11 .
  • the liquid crystal panel includes a bottom glass 21 , a top glass 23 , and liquid crystal 22 injected between the bottom glass 21 and the top glass 23 .
  • the bottom glass 21 and the top glass 23 are sealed. Any type of liquid crystal panel may be used in the liquid crystal display device. Accordingly, a detailed explanation of a structure of the liquid crystal panel is omitted because it is well-known to those skilled in the art.
  • FIG. 3A illustrates a method of sequentially turning on point light sources of divided luminance area in a backlight unit according to an embodiment of the present invention.
  • FIG. 3B shows partially turned on point light source lines in a backlight unit according to an embodiment of the present invention.
  • a horizontal axis represents a frame of a picture, that is, time
  • a vertical axis indicates each line of point light sources in the backlight unit.
  • an LCD TV screen is sequentially scanned from an upper portion of the screen to a bottom portion of the screen to form an image of one frame. The upper portion of the screen is re-scanned to form the next frame right before completing scanning the bottom portion of the screen.
  • the motion blur is not effectively eliminated since the entire surface of a liquid crystal panel is always illuminated regardless of areas of the liquid crystal panel scanned.
  • the plurality of point light source lines 11 a to 11 n are sequentially turned on and off at a predetermined time interval by synchronizing with a scanning time of the liquid crystal panel. Therefore, the motion blur is effectively eliminated.
  • the first point light source line 11 a is turned on at the moment when a picture of an N th frame is scanned on the upper portion of the liquid crystal panel.
  • the second point light source line 11 b is turned on according to a scanning time of the liquid crystal panel.
  • the lines 11 a through 11 n are sequentially turned on, so that illumination of the backlight unit for the N th frame image is completed.
  • Each of the turned-on point light source lines is tuned off after a predetermined time has elapsed, and they are turned on again for forming an image of a next frame.
  • the point light source lines are repeatedly turned on and off in a predetermined cycle, and each of the point light source lines is controlled to be turned on after point light sources of a previous line are turned on and a predetermined time period has elapsed.
  • the turning-on and off cycle of each of the point light source lines and a turning-on delay time between adjacent point light source lines depend upon a vertical scanning frequency of a liquid crystal panel and the number of point light source lines.
  • the point light source lines are sequentially turned on within a predetermined period in the backlight unit according to the present embodiment. Therefore, at an arbitrary time, only a portion of the backlight unit instead of the entire area thereof is turned on as illustrated in FIG. 3B .
  • the backlight unit Since the backlight unit must be partially emitted at an arbitrary time, the backlight unit needs to prevent light emitted from the turned-on luminance areas from being diffused to adjacent divided luminance areas that are not turned on. That is, one line of point light sources must not irradiate light to areas of adjacent lines of point light sources.
  • the reflector sheets 13 prevent the light emitted from one point light source line to be diffused to areas of adjacent point light source lines.
  • the backlight unit according to the present embodiment uses the LD or the LED as a light source instead of using the CCFL, the backlight unit provides superior color reproducibility and longer lifespan as compared to a conventional backlight unit. Since the backlight unit according to the present embodiment sequentially turns on the point light sources in synchronization with a screen scanning of a liquid crystal display, the motion blur is effectively eliminated. Furthermore, the uniformity of light irradiated from the point light source to the diffusion plate improves because the backlight unit according to the present embodiments is a direct light type and includes the reflector sheets between lines of point light sources. Therefore, image overlapping or screen blurring does not occur.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
US11/293,227 2005-04-04 2005-12-05 Backlight unit and liquid crystal display device employing the same Expired - Fee Related US7740364B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2005-0028068 2005-04-04
KR1020050028068A KR100716996B1 (ko) 2005-04-04 2005-04-04 백라이트 유닛 및 이를 채용한 액정표시장치

Publications (2)

Publication Number Publication Date
US20060221629A1 US20060221629A1 (en) 2006-10-05
US7740364B2 true US7740364B2 (en) 2010-06-22

Family

ID=37070169

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/293,227 Expired - Fee Related US7740364B2 (en) 2005-04-04 2005-12-05 Backlight unit and liquid crystal display device employing the same

Country Status (4)

Country Link
US (1) US7740364B2 (nl)
KR (1) KR100716996B1 (nl)
CN (1) CN100465736C (nl)
NL (1) NL1031501C2 (nl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080244943A1 (en) * 2007-04-06 2008-10-09 Element Labs, Inc. Variable Baffle for Low Resolution Displays

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100804069B1 (ko) * 2006-06-02 2008-02-18 (주)비노시스 3ｄ 동영상 화질 개선 장치
KR101410465B1 (ko) * 2007-02-22 2014-06-23 삼성디스플레이 주식회사 백라이트 장치 및 이를 갖는 액정표시장치
KR101356507B1 (ko) * 2007-06-25 2014-01-29 엘지전자 주식회사 액정 표시 장치
KR101510907B1 (ko) 2009-04-30 2015-04-10 엘지디스플레이 주식회사 백라이트 유닛 및 이를 구비한 액정표시장치
KR101329967B1 (ko) * 2010-05-11 2013-11-13 엘지디스플레이 주식회사 백 라이트 유닛과 이를 이용한 액정 표시장치 및 그의 구동방법
CN101893190B (zh) * 2010-07-14 2013-04-24 深圳市华星光电技术有限公司 区域调光背光模块与使用该背光模块的液晶显示器
US8833959B2 (en) 2012-02-02 2014-09-16 Blackberry Limited Display arrangement with optical structure for reducing halo effect
EP2624096B1 (en) * 2012-02-02 2015-12-16 BlackBerry Limited Display arrangement with optical structure for reducing halo effect
TWI537648B (zh) * 2013-03-22 2016-06-11 友達光電股份有限公司 發光元件封裝結構

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390810A (en) * 1979-07-09 1983-06-28 Tokyo Shibaura Denki Kabushiki Kaisha Semiconductor light-emitting display device
JPH05275747A (ja) * 1992-03-26 1993-10-22 Rohm Co Ltd セグメント型文字表示装置
US5390093A (en) * 1992-03-04 1995-02-14 K.C.C. Shokai Limited Illuminating display device for use with a mosaic panel
JPH1010997A (ja) 1996-06-27 1998-01-16 Canon Inc 表示装置の駆動方法
US5819454A (en) * 1993-12-30 1998-10-13 Rosenitsch; Harald Display device having triangular reflectors
US5836676A (en) 1996-05-07 1998-11-17 Koha Co., Ltd. Light emitting display apparatus
CN1321912A (zh) 2000-05-02 2001-11-14 邱励楠 场顺序式彩色液晶显示器件
JP2002072167A (ja) 2000-06-15 2002-03-12 Sharp Corp 画像表示装置、照明装置、照明装置の駆動方法
JP2002244574A (ja) 2001-02-13 2002-08-30 Victor Co Of Japan Ltd 情報表示装置のバックライト装置
KR20040057383A (ko) 2002-12-26 2004-07-02 엘지.필립스 엘시디 주식회사 표시장치의 백 라이트 유닛 및 그 백라이트 유닛을 사용한액정표시장치
JP2004200139A (ja) 2002-12-17 2004-07-15 Ind Technol Res Inst 直下型バックライトモジュール
CN1553257A (zh) 2003-05-28 2004-12-08 友达光电股份有限公司 背光模块液晶显示器
CN1564067A (zh) 2004-04-15 2005-01-12 友达光电股份有限公司 背光组件
US7152988B2 (en) * 2004-03-30 2006-12-26 Chi Mei Optoelectronics Corp. Direct point-light type backlight module and liquid crystal display using the same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001318614A (ja) 2000-05-09 2001-11-16 Mitsubishi Electric Corp 面光源装置及びこれを用いた液晶表示装置
KR100438522B1 (ko) * 2001-08-21 2004-07-03 엘지.필립스 엘시디 주식회사 백라이트 유닛
KR100878269B1 (ko) * 2002-06-18 2009-01-13 삼성전자주식회사 시간 분할 색상 표시 방식의 액정 표시 장치와 그 구동방법 및 백라이트 장치
KR100505182B1 (ko) * 2003-03-29 2005-08-01 엘지.필립스 엘시디 주식회사 액정 표시장치의 백라이트 구조
US6811282B1 (en) * 2003-04-18 2004-11-02 Heng Huang Kuo Straight down-type backlight module assembly structure

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4390810A (en) * 1979-07-09 1983-06-28 Tokyo Shibaura Denki Kabushiki Kaisha Semiconductor light-emitting display device
US5390093A (en) * 1992-03-04 1995-02-14 K.C.C. Shokai Limited Illuminating display device for use with a mosaic panel
JPH05275747A (ja) * 1992-03-26 1993-10-22 Rohm Co Ltd セグメント型文字表示装置
US5819454A (en) * 1993-12-30 1998-10-13 Rosenitsch; Harald Display device having triangular reflectors
US5836676A (en) 1996-05-07 1998-11-17 Koha Co., Ltd. Light emitting display apparatus
JPH1010997A (ja) 1996-06-27 1998-01-16 Canon Inc 表示装置の駆動方法
CN1321912A (zh) 2000-05-02 2001-11-14 邱励楠 场顺序式彩色液晶显示器件
JP2002072167A (ja) 2000-06-15 2002-03-12 Sharp Corp 画像表示装置、照明装置、照明装置の駆動方法
JP2002244574A (ja) 2001-02-13 2002-08-30 Victor Co Of Japan Ltd 情報表示装置のバックライト装置
JP2004200139A (ja) 2002-12-17 2004-07-15 Ind Technol Res Inst 直下型バックライトモジュール
KR20040057383A (ko) 2002-12-26 2004-07-02 엘지.필립스 엘시디 주식회사 표시장치의 백 라이트 유닛 및 그 백라이트 유닛을 사용한액정표시장치
CN1553257A (zh) 2003-05-28 2004-12-08 友达光电股份有限公司 背光模块液晶显示器
US7152988B2 (en) * 2004-03-30 2006-12-26 Chi Mei Optoelectronics Corp. Direct point-light type backlight module and liquid crystal display using the same
CN1564067A (zh) 2004-04-15 2005-01-12 友达光电股份有限公司 背光组件

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
English translation of the Japanese Patent No. JP 410010997 A (Kurematsu) provided by the Advanced Industrial Property Network (AIPN) of the Japanese Patent Office. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080244943A1 (en) * 2007-04-06 2008-10-09 Element Labs, Inc. Variable Baffle for Low Resolution Displays

Also Published As

Publication number Publication date
US20060221629A1 (en) 2006-10-05
CN100465736C (zh) 2009-03-04
CN1847953A (zh) 2006-10-18
NL1031501C2 (nl) 2007-05-30
NL1031501A1 (nl) 2006-10-09
KR100716996B1 (ko) 2007-05-10
KR20060105347A (ko) 2006-10-11

Similar Documents

Publication Publication Date Title
US7740364B2 (en) Backlight unit and liquid crystal display device employing the same
US7636138B2 (en) Backlight unit and liquid crystal display employing the same, comprising at least one barrier rib between point light sources, substantially inserted into a diffusion plate
US20060221611A1 (en) Back light unit and liquid crystal display employing the same
US20060262079A1 (en) Backlight unit and liquid crystal display employing the same
US8104945B2 (en) Backlight unit implementing local dimming for liquid crystal display device
TWI479234B (zh) 顯示裝置
US7588364B2 (en) Spread illuminating apparatus of multiple panel type
JP5211667B2 (ja) 照明装置及び表示装置
JP4926928B2 (ja) 照明装置および液晶表示装置
JP2004342587A (ja) バックライトおよびそれを用いた液晶表示装置
JP4160481B2 (ja) 面状光源装置及び表示装置
JP2012248769A (ja) 発光装置および表示装置
JP4736656B2 (ja) 表示装置
US7655955B2 (en) Light emitting device and backlight unit using the same as light source and field sequential LCD apparatus employing the backlight unit
KR20060093956A (ko) 일체형 반사용 부재를 구비한 액정표시장치의 백라이트 유닛
KR101473841B1 (ko) 직하형 백라이트 어셈블리 및 이를 구비한 액정표시장치
KR100739758B1 (ko) 색 순차 구동 액정표시장치용 백라이트 유닛
JP2008004511A (ja) 多色照明装置
KR20070054038A (ko) 색 순차 구동 액정표시장치용 백라이트 유닛
JP2017062876A (ja) 光源装置

Legal Events

Date Code Title Description
AS Assignment

Owner name: SAMSUNG ELECTRONICS CO., LTD.,KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SEONG, KI-BUM;JUNG, IL-YONG;CHO, TAE-HEE;AND OTHERS;REEL/FRAME:017883/0343

Effective date: 20060329

Owner name: SAMSUNG ELECTRONICS CO., LTD., KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SEONG, KI-BUM;JUNG, IL-YONG;CHO, TAE-HEE;AND OTHERS;REEL/FRAME:017883/0343

Effective date: 20060329

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FEPP Fee payment procedure

Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20140622